ECNR Class RK5 250Vac, 1 to 60A Dual-Element, Time-Delay Fuses Dimensions (inches) Catalog Symbol: ECNR Dual-Element, Time-Delay – 10 seconds (minimum) at 500% rated current (8 seconds for fuses 30A or less) Current-Limiting Volts: 250Vac (or less) 125Vdc (or less) Amps: 1 to 60A IR: 200kA RMS Sym. Agency Information: CE, UL Listed, Std. 248-12, Class RK-5, Guide JDDZ, File E162363, CSA Certified, C22.2 No. 248.12, Class 1422-02, File 700489 Catalog Numbers (amps) ECNR1 ECNR7 ECNR17.5 ECNR2 ECNR8 ECNR20 ECNR3 ECNR9 ECNR25 ECNR4 ECNR10 ECNR30 ECNR5 ECNR12 ECNR35 ECNR6 ECNR15 ECNR40 ECNR45 ECNR50 ECNR60 Features Carton Quantity and Weight Carton Weight per Carton Amps Quantity lbs kg 1–15 10 0.40 0.18 17.5–30 10 0.50 0.23 35–60 10 1.00 0.45 • Provides motor overload, ground fault and short-circuit protection. Class RK5 Fuse Blocks (250V) Catalog Data • Helps protect motors against burnout from overloads. • Simplifies and improves blackout prevention (selective coordination). • Dual-element fuses can be applied in circuits subject to temporary motor overloads and surge currents to provide both high performance short-circuit and overload protection. Poles • Helps protect motors against burnout from singlephasing on three-phase systems. (Clip Retaining Spring Standard, Suffix “R”) Terminal Type (Suffix No.) 1 Basic Screw Box Lug ¼4" Catalog — w/ Pres. — w/ Clip Quick Number Plate CU only Connect Amps 1 1 R25030-1 SR PR CR COR QR to 2 R25030-2 SR PR CR COR — 30 3 R25030-3 SR PR CR COR — 31 1 R25060-1 — — CR — — to 2 R25060-2 — — CR — — 60 3 R25060-3 — — CR — — • The overload element provides protection against low level overcurrent of overloads and will hold an overload which is five times greater than the amp rating of the fuse for a minimum of ten seconds. 0509 BU-SB08624 Form No. ECNR 1-60 Page 1 of 2 Data Sheet #1315 ECNR Class RK5 250Vac, 1 to 60A Dual-Element, Time-Delay Fuses Current Limitation Curves Time-Current Characteristic Curves– Average Melt 8 10 15 30 60 Time-Current Characteristic Curves– Average Melt Fuse Reducers For Class R Fuses Equipment Desired Fuse Catalog Number Fuse Clips (Case) Size (Pairs) 250V 60A 30A No. 263-R 100A 30A No. 213-R 60A No. 216-R 200A 60A No. 226-R The only controlled copy of this document is the electronic read-only version maintained by Cooper Bussmann. All other copies of this document are by definition uncontrolled. This bulletin is intended to clearly present comprehensive product data and provide technical information that will help the end user with design applications. Cooper Bussmann reserves the right, without notice, to change design or construction of any products and to discontinue or limit distribution of any products. Cooper Bussmann also reserves the right to change or update, without notice, any technical information contained in this bulletin. Once a product has been selected, it should be tested by the user in all possible applications. 0509 BU-SB08624 Form No. ECNR 1-60 Page 2 of 2 Data Sheet #1315